21213105053 has 16 divisors (see below), whose sum is σ = 25683091200. Its totient is φ = 17104125696.

The previous prime is 21213104993. The next prime is 21213105079. The reversal of 21213105053 is 35050131212.

It is a happy number.

It is not a de Polignac number, because 21213105053 - 2²⁸ = 20944669597 is a prime.

It is a super-2 number, since 2×21213105053² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213105553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186200 + ... + 277662.

It is an arithmetic number, because the mean of its divisors is an integer number (1605193200).

Almost surely, 2^21213105053 is an apocalyptic number.

It is an amenable number.

21213105053 is a deficient number, since it is larger than the sum of its proper divisors (4469986147).

21213105053 is a wasteful number, since it uses less digits than its factorization.

21213105053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93436.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 21213105053 its reverse (35050131212), we get a palindrome (56263236265).

The spelling of 21213105053 in words is "twenty-one billion, two hundred thirteen million, one hundred five thousand, fifty-three".